采用脉冲VP-TIG焊接方法，对5.5 mm厚2219-T87和5A06-H112铝合金进行了异种铝合金对接试验，分析了接头组织及力学性能. 结果表明，焊接接头显微组织存在明显差异，5A06侧热影响区为等轴晶，2219侧热影响区的板条状组织发生粗化，焊缝由等轴晶构成. 2219侧熔合线附近存在细小等轴晶带和气孔缺陷，小角度晶界比5A06侧熔合线附近更少，导致拉伸过程中易沿2219侧熔合线附近发生破坏. 拉伸过程中试样沿2219侧熔合线附近最大应变处断裂.接头抗拉强度分别达到2219、5A06母材的63.6%和75.3%，断后伸长率分别达到2219、5A06母材的30.5%和29.8%.
Two different aluminum alloys of 2219-T87 and 5A06-H112 with thickness of 5.5 mm were jointed using plused VP-TIG butt welding. The microstructure and mechanical properties of the joint was investigated. The results show that the microstructure in heat-affected zone on the 5A06 side is equiaxed crystal, the strip structure in the heat-affected zone on the 2219 side is getting coarser, and the welding seam is composed of equiaxed crystal. The fine equiaxed crystal band and porosity defects near the fusion line on the 2219 side, and the low angle grain boundary near the fusion line on the 2219 side is less than that near the fusion line on the 5A06 side, which lead to the failure of the fusion line on the 2219 side during the tensile texts. During the tensile texts, the fracture of the specimen occurred along the maximum strain near the fusion line of 2219 side. The tensile strength of the joint reached 63.6% and 75.3% of the base material of 2219 and 5A06, and the elongation reached 30.5% and 29.8% of the base material of 2219 and 5A06, respectively.
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